84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
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/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <string.h>
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#include <utils/Errors.h>
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#include <gui/BitTube.h>
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#include <gui/DisplayEventReceiver.h>
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#include <gui/IDisplayEventConnection.h>
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#include <private/gui/ComposerService.h>
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#include <surfaceflinger/ISurfaceComposer.h>
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// ---------------------------------------------------------------------------
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namespace android {
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// ---------------------------------------------------------------------------
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DisplayEventReceiver::DisplayEventReceiver() {
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sp<ISurfaceComposer> sf(ComposerService::getComposerService());
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if (sf != NULL) {
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mEventConnection = sf->createDisplayEventConnection();
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if (mEventConnection != NULL) {
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mDataChannel = mEventConnection->getDataChannel();
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}
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}
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}
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DisplayEventReceiver::~DisplayEventReceiver() {
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}
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status_t DisplayEventReceiver::initCheck() const {
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if (mDataChannel != NULL)
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return NO_ERROR;
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return NO_INIT;
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}
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int DisplayEventReceiver::getFd() const {
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if (mDataChannel == NULL)
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return NO_INIT;
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return mDataChannel->getFd();
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}
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ssize_t DisplayEventReceiver::getEvents(DisplayEventReceiver::Event* events,
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size_t count) {
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ssize_t size = mDataChannel->read(events, sizeof(events[0])*count);
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LOGE_IF(size<0,
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"DisplayEventReceiver::getEvents error (%s)",
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strerror(-size));
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if (size >= 0) {
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// Note: if (size % sizeof(events[0])) != 0, we've got a
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// partial read. This can happen if the queue filed up (ie: if we
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// didn't pull from it fast enough).
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// We discard the partial event and rely on the sender to
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// re-send the event if appropriate (some events, like VSYNC
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// can be lost forever).
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// returns number of events read
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size /= sizeof(events[0]);
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}
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return size;
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}
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// ---------------------------------------------------------------------------
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}; // namespace android
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